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Green-Yellow Electrophosphorescence from di [2,5-diphenyl-1,3,4-oxadiazole C2, N3 Platinum(II) Doped PVK Devices |
| LIU Jian1;ZHU Mei-Xiang1;JIANG Chang-Yun2;LIU Yu1,3;WU Zhong-Lian1;LI Jian-Ren1;XING Kong-Qiang3;CAO Yong2;ZHU Wei-Guo1 |
| 1College of Chemistry, Xiangtan University, Xiangtan 411105
2Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640
3Department of Chemistry, Qiongzhou University, Wuzhishan 572200 |
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| Cite this article: |
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LIU Jian, ZHU Mei-Xiang, JIANG Chang-Yun et al 2005 Chin. Phys. Lett. 22 723-726 |
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Abstract Employing a blend of poly (N-vinylcarbazole) (PVK) and 5-biphenyl-2-(4-tert-butyl)phenyl-1,3,4-oxadiazole) (PBD) as host matrix and a novel bicyclometalated Pt-complex containing 1,3,4-oxadiazole moiety as guest matrix with 2wt.% doping concentration, we have demonstrated efficient phosphorescence-based polymer light-emitting devices (PLEDs). The devices emitted intense green--yellow electrophosphorescence. No emission from either PVK or PBD was observed for the devices. The electroluminescence spectrum exhibited three primary peaks at 525nm, 568nm and 608nm. A maximum external quantum efficiency of 2.3% ph/el and a luminous efficiency of 3.8cd/A were achieved at a current density of 3.4mA/cm2. The results demonstrate that highly efficient electrophosphorescence can be achieved from platinum complex-based polymer light-emitting devices.
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| Keywords:
78.60.Fi
78.66.Qn
85.60.Jb
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Published: 01 March 2005
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